[PATCH] lib/crypto, efi_loader: avoid multiple inclusions of header files

[AKASHI Takahiro]

Heinrich,

On Thu, Apr 23, 2020 at 09:34:37AM +0200, Heinrich Schuchardt wrote:
> On 23.04.20 02:28, AKASHI Takahiro wrote:
> > Heinrich,
> >
> > On Tue, Apr 21, 2020 at 12:23:13PM +0200, Heinrich Schuchardt wrote:
> >> On 4/21/20 2:37 AM, AKASHI Takahiro wrote:
> >>> By adding extra symbols, we can now avoid including x509_parser and
> >>> pkcs7_parser.h files multiple times.
> >>>
> >>> Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> >>> Suggested-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
> >>> ---
> >>>  lib/crypto/pkcs7_parser.h         | 4 ++++
> >>>  lib/crypto/x509_parser.h          | 4 ++++
> >>>  lib/efi_loader/efi_image_loader.c | 1 +
> >>>  lib/efi_loader/efi_signature.c    | 1 +
> >>>  4 files changed, 10 insertions(+)
> >>>
> >>> diff --git a/lib/crypto/pkcs7_parser.h b/lib/crypto/pkcs7_parser.h
> >>> index 6565fdc2d4ca..b8234da45a6a 100644
> >>> --- a/lib/crypto/pkcs7_parser.h
> >>> +++ b/lib/crypto/pkcs7_parser.h
> >>> @@ -5,6 +5,9 @@
> >>>   * Written by David Howells (dhowells at redhat.com)
> >>>   */
> >>>
> >>> +#ifndef _PKCS7_PARSER_H
> >>> +#define _PKCS7_PARSER_H
> >>> +
> >>>  #include <linux/oid_registry.h>
> >>>  #include <crypto/pkcs7.h>
> >>>  #include "x509_parser.h"
> >>> @@ -63,3 +66,4 @@ struct pkcs7_message {
> >>>  	size_t		data_hdrlen;	/* Length of Data ASN.1 header */
> >>>  	const void	*data;		/* Content Data (or 0) */
> >>>  };
> >>> +#endif /* _PKCS7_PARSER_H */
> >>> diff --git a/lib/crypto/x509_parser.h b/lib/crypto/x509_parser.h
> >>> index c233f136fb35..4cbdc1d6612d 100644
> >>> --- a/lib/crypto/x509_parser.h
> >>> +++ b/lib/crypto/x509_parser.h
> >>> @@ -5,6 +5,9 @@
> >>>   * Written by David Howells (dhowells at redhat.com)
> >>>   */
> >>>
> >>> +#ifndef _X509_PARSER_H
> >>> +#define _X509_PARSER_H
> >>> +
> >>>  #include <linux/time.h>
> >>>  #include <crypto/public_key.h>
> >>>  #include <keys/asymmetric-type.h>
> >>> @@ -55,3 +58,4 @@ extern int x509_decode_time(time64_t *_t,  size_t hdrlen,
> >>>   */
> >>>  extern int x509_get_sig_params(struct x509_certificate *cert);
> >>>  extern int x509_check_for_self_signed(struct x509_certificate *cert);
> >>> +#endif /* _X509_PARSER_H */
> >>> diff --git a/lib/efi_loader/efi_image_loader.c b/lib/efi_loader/efi_image_loader.c
> >>> index 6c270ce94f44..899adf8493d0 100644
> >>> --- a/lib/efi_loader/efi_image_loader.c
> >>> +++ b/lib/efi_loader/efi_image_loader.c
> >>> @@ -14,6 +14,7 @@
> >>>  #include <pe.h>
> >>>  #include <sort.h>
> >>>  #include "../lib/crypto/pkcs7_parser.h"
> >>> +#include "../lib/crypto/x509_parser.h"
> >>
> >> As pkcs7_parser.h includes x509_parser.h there is no reason to include
> >> it again.
> >
> > No, I don't think so.
> >
> > My style of coding is that, if a symbol is used in a C file and it is
> > defined in a header file, the header file should be *directly* included
> > in the C file.
> > I believe that it is the common way so that we can avoid any "implicit"
> > dependencies among header files.
> 
> We want U-Boot to build as fast as possible. So we should not include
> anything twice. When looking through the rest of the U-Boot code you
> will have noticed that we do not include malloc.h and stdio.h everywhere
> because it is included via common.h.

The same comment here.

-Takahiro Akashi

> As an example of a patch removing other unnecessary includes see for
> instance:
> 
> cmd: fat: remove unused includes
> fd0e30b43b6b2401e68dc32c357869c617d4fdd1
> 
> Best regards
> 
> Heinrich
> 
> >
> > Thanks,
> > -Takahiro Akashi
> >
> >
> >>>
> >>>  const efi_guid_t efi_global_variable_guid = EFI_GLOBAL_VARIABLE_GUID;
> >>>  const efi_guid_t efi_guid_device_path = EFI_DEVICE_PATH_PROTOCOL_GUID;
> >>> diff --git a/lib/efi_loader/efi_signature.c b/lib/efi_loader/efi_signature.c
> >>> index 658e3547da37..6ad09e4acbd7 100644
> >>> --- a/lib/efi_loader/efi_signature.c
> >>> +++ b/lib/efi_loader/efi_signature.c
> >>> @@ -15,6 +15,7 @@
> >>>  #include <u-boot/rsa.h>
> >>>  #include <u-boot/sha256.h>
> >>>  #include "../lib/crypto/pkcs7_parser.h"
> >>> +#include "../lib/crypto/x509_parser.h"
> >>
> >> Same here.
> >>
> >> The rest is correct and should be merged.
> >>
> >> Best regards
> >>
> >> Heinrich
> >>
> >>>
> >>>  const efi_guid_t efi_guid_image_security_database =
> >>>  		EFI_IMAGE_SECURITY_DATABASE_GUID;
> >>>
> >>
>